fix: enable scale/rotation on annotation objects and restore transforms on load

- Remove hasControls:false and lockScaling from markers so resize/rotate handles appear
- Add setActiveObject() after creating arrows and rectangles for immediate control visibility
- Restore angle, scaleX, scaleY when loading saved annotations (all object types)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

client/templates/maker/task_drawing.html

@@ -353,7 +353,7 @@
 <script>
   pdfjsLib.GlobalWorkerOptions.workerSrc = 'https://cdnjs.cloudflare.com/ajax/libs/pdf.js/3.11.174/pdf.worker.min.js';
 </script>
-<script src="{{ url_for('static', filename='js/annotation-editor.js') }}?v=8"></script>
+<script src="{{ url_for('static', filename='js/annotation-editor.js') }}?v=9"></script>
 <script>
 function taskDrawing() {
   const taskData = window.__taskData || {};